EP1651273A1 - Poly-4-hydroxybutyrate matrices for sustained drug delivery - Google Patents
Poly-4-hydroxybutyrate matrices for sustained drug deliveryInfo
- Publication number
- EP1651273A1 EP1651273A1 EP04777860A EP04777860A EP1651273A1 EP 1651273 A1 EP1651273 A1 EP 1651273A1 EP 04777860 A EP04777860 A EP 04777860A EP 04777860 A EP04777860 A EP 04777860A EP 1651273 A1 EP1651273 A1 EP 1651273A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- drug
- delivery system
- drug delivery
- hydroxybutyrate
- release
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
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- 238000000034 method Methods 0.000 claims abstract description 20
- 238000013270 controlled release Methods 0.000 claims abstract description 10
- SJZRECIVHVDYJC-UHFFFAOYSA-M 4-hydroxybutyrate Chemical compound OCCCC([O-])=O SJZRECIVHVDYJC-UHFFFAOYSA-M 0.000 claims abstract description 8
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- 108091032973 (ribonucleotides)n+m Proteins 0.000 description 1
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Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K9/00—Medicinal preparations characterised by special physical form
- A61K9/14—Particulate form, e.g. powders, Processes for size reducing of pure drugs or the resulting products, Pure drug nanoparticles
- A61K9/16—Agglomerates; Granulates; Microbeadlets ; Microspheres; Pellets; Solid products obtained by spray drying, spray freeze drying, spray congealing,(multiple) emulsion solvent evaporation or extraction
- A61K9/1605—Excipients; Inactive ingredients
- A61K9/1629—Organic macromolecular compounds
- A61K9/1641—Organic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polyethylene glycol, poloxamers
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K9/00—Medicinal preparations characterised by special physical form
- A61K9/0012—Galenical forms characterised by the site of application
- A61K9/0019—Injectable compositions; Intramuscular, intravenous, arterial, subcutaneous administration; Compositions to be administered through the skin in an invasive manner
- A61K9/0024—Solid, semi-solid or solidifying implants, which are implanted or injected in body tissue
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K9/00—Medicinal preparations characterised by special physical form
- A61K9/20—Pills, tablets, discs, rods
- A61K9/2004—Excipients; Inactive ingredients
- A61K9/2022—Organic macromolecular compounds
- A61K9/2031—Organic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polyethylene glycol, polyethylene oxide, poloxamers
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P31/00—Antiinfectives, i.e. antibiotics, antiseptics, chemotherapeutics
Definitions
- the present invention generally relates to drug delivery systems derived from poly-4-hydroxybutyrate.
- the use of biodegradable polymers to make drug delivery systems is well established.
- Berde and Langer have also reported drawbacks of certain degradable polyanhydride drug delivery systems that include fast initial release of drug, and inflammatory responses to the device or the formation of a capsule of serous material or fibrin.
- certain applications such as the treatment of chronic or persistent pain, long- term contraception or administration of antibiotics, growth factors, or chemotherapeutics, or prevention of restenosis after stent implantation, it would be advantageous to develop systems that can administer drugs for prolonged periods of time.
- Biodegradable controlled release systems providing prolonged controlled release of drugs, and methods for the manufacture thereof are disclosed.
- the systems are formed from a biocompatible, biodegradable polymer, in particular poly-4-hydroxybutyrate (PHA440) or copolymers thereof.
- Copolymers of 4-hydroxybutyrate include but are not limited to poly-3-hydroxybutyrate-co-4-hydroxybutyrate (PHA3444), and poly-4- hydoxybutyrate-co-glycolate (PHA4422).
- Drugs are generally incorporated into the polymer using a method that yields a uniform dispersion. The type of drug and the quantity are selected based on the known pharmaceutical properties of these compounds.
- the systems may be administered for example by implantation, injection, topical administration, or oral ingestion. They may also be used in combination with a medical device, for example, a stent.
- a medical device for example, a stent.
- a major advantage of the drug delivery system is that it does not need to be removed after use since it is slowly degraded and cleared by the patient's body.
- the device has desirable physical properties, including strength, modulus and elongation.
- Figures 1A and IB are the chemical structures of poly-4- hydroxybutyrate (PHA4400) and poly-3-hydroxybutyrate-co-4- hydroxybutyrate (PHA3444).
- Figure 2 is sdescription of the biosynthetic pathways for the production of PHA4400 (P4HB). Pathway enzymes are: 1.
- Figure 3A Average cumalative (%) release vs. time;
- Figure 3B Average Cum. (%) release vs. square root time .
- Figure 4A Average Cum. (%) release vs. time;
- Figure 4B Average Cumulative (%) release vs. square root time.
- Figures 5 A and 5B are graphs of the release of Tetracycline from
- FIG. 1 shows Average Cumulative (%) release versus time;
- Figure 5B shows Average Cumulative (%) release versus square root time.
- Figure 6A shows Average Cumulative (%) release versus time
- Figure 6B shows Average Cumulative (%) release versus square root time.
- Biodegradable drug delivery systems for the controlled and prolonged release of drugs are provided. These systems can be used where it is necessary to administer a controlled amount of drug over a prolonged period, and/or to employ a system requiring a high drug loading.
- Poly-4-hydroxybutyrate means a homopolymer comprising 4- hydroxybutyrate units. It may be referred to as PHA4400 or P4HB.
- Copolymers of poly-4-hydroxybutyrate mean any polymer comprising 4- hydroxybutyrate with one or more different hydroxy acid units, for example, poly-3-hydroxybutyrate-co-4-hydroxybutyrate (PH3444).
- Biocompatible refers to materials that are not toxic, and do not elicit severe inflammatory or chronic responses in vivo. Any metabolites of these materials should also be biocompatible.
- Biodegradation means that the polymer must break down or dissolve away in vivo, preferably in less than two years, and more preferably in less than one year. Biodegradation refers to a process in an animal or human. The polymer may break down by surface erosion, bulk erosion, hydrolysis or a combination of these mechanisms.
- microspheres also includes nanospheres, microparticles, and microcapsules.
- Drug Delivery Devices A. Polymers Poly-4-hydroxybutyrate (PHA4400) is a strong, pliable thermoplastic that is produced by a fermentation process (see US Patent No.
- the polymer belongs to a larger class of materials called polyhydroxyalkanoates (PHAs) that are produced by numerous microorganims (for reviews see: Steinb ⁇ chel, A. (1991) Polyhydroxyalkanoic acids, in Biomaterials, (Byrom, D., Ed.), pp.
- PHAs polyhydroxyalkanoates
- PHAs Polyhydroxyalkanoates
- the PHA biopolymers may be broadly divided into three groups according to the length of their pendant groups and their respective biosynthetic pathways. Those with short pendant groups, such as polyhydroxybutyrate (PHB), a homopolymer of R-3-hydroxybutyric acid (R- 3HB) units, are highly crystalline thermoplastic materials, and have been known the longest (Lemoigne & Roukhelman, Annales des fermentations, 5:527-36 (1925)).
- PHB polyhydroxybutyrate
- R- 3HB R-3-hydroxybutyric acid
- the PHA polymers may constitute up to 90% of the dry cell weight of bacteria, and are found as discrete granules inside the bacterial cells. These PHA granules accumulate in response to nutrient limitation and serve as carbon and energy reserve materials. Distinct pathways are used by microorganisms to produce each group of these polymers.
- SPGPHAs short pendant group polyhydroxyalkanoates
- One of these pathways leading to the short pendant group polyhydroxyalkanoates (SPGPHAs) involves three enzymes, namely thiolase, reductase and PHB synthase (sometimes called polymerase).
- the homopolymer PHB is synthesized by condensation of two molecules of acetyl-Coenzyme A to give acetoacetyl-Coenzyme A, followed by reduction of this intermediate to R-3-hydroxybutyryl-Coenzyme A, and subsequent polymerization.
- the last enzyme in this pathway namely the synthase, has a substrate specificity that can accommodate C3-C5 monomeric units including R-4-hydroxy acid and R-5-hydroxy acid units.
- This biosynthetic pathway is found, for example, in the bacteria Zoogloea ramigera and Alcaligenes eutrophus.
- the biosynthetic pathway which is used to make the third group of PHAs namely the long pendant group polyhydroxyalkanoates (LPGPHAs)
- LPGPHAs long pendant group polyhydroxyalkanoates
- the R-3-hydroxyacyl-Coenzyme substrates resulting from these routes are then polymerized by PHA synthases (sometimes called polymerases) that have substrate specificities favoring the larger monomeric units in the C6-C14 range.
- PHA synthases sometimes called polymerases
- the second group of PHAs containing both short R-3HB units and longer pendant group monomers utilize both the pathways described above to provide the hydroxy acid monomers.
- the latter are then polymerized by PHA synthases able to accept these units.
- PHA synthases able to accept these units.
- these include PHAs containing functionalized pendant groups such as esters, double bonds, alkoxy, aromatic, halogens and hydroxy groups.
- functionalized pendant groups such as esters, double bonds, alkoxy, aromatic, halogens and hydroxy groups.
- PHA polymers may also be derived by chemical synthesis.
- One widely used approach involves the ring-opening polymerization of ⁇ -lactone monomers using various catalysts or initiators such as aluminoxanes, distannoxanes, or alkoxy-zinc and alkoxy-aluminum compounds (see Agostini, et al., Polym.
- PHA3444 It is a co- polymer of (R)-3 -hydroxybutyrate and 4-hydroxybutyrate.
- the chemical structure of PHA3444 is shown in Figure IB.
- PHA3444 is a tough and elastic semi-crystalline polymer. The crystallinity and many mechanical properties of PHA3444 depend upon the ratio of monomers (i.e. percentage of 3 -hydroxybutyrate (3HB or 34 unit) and 4-hydroxybutyrate monomers
- the percentage of the 4HB or 44 unit can be varied from 1% to 99% depending upon the fermentation conditions used to produce the copolymer.
- Other copolymers in the PHA family include poly-3- hydroxybutyrate-co-3-hydroxyvalerate (PHBV), poly-hydroxyoctanoate-co- hexanoate (PHO) and poly-4-hydoxybutyrate-co-glycolate (PHA4422).
- PHBV poly-3- hydroxybutyrate-co-3-hydroxyvalerate
- PHO poly-hydroxyoctanoate-co- hexanoate
- PHA4422 poly-4-hydoxybutyrate-co-glycolate
- PHA3444 to develop controlled release systems for the treatment of osteomyelitis.
- U.S. Patent No. 6,548,569 to Williams et al discloses different forms of PHA4400 (also known as P4HB) including compression molded porous samples, fibers, foams, coated meshes, and microspheres.
- the polyhydroxyalkanoate polymers should be biocompatible and biodegradable.
- the polymers are typically prepared by fermentation.
- Preferred polymers are poly-4-hydroxybutyrate and copolymers thereof.
- a preferred copolymer is ⁇ oly-3-hydroxybutyrate-co-4-hydroxybutyrate.
- examples of these polymers are produced by Tepha, Inc. of Cambridge, MA using transgenic fermentation methods, and have weight average molecular weights in the region of 50,000 to 1,000,000.
- B. Drugs The drug used in a particular drug release formulation will depend upon the specific treatment. The examples describe antibiotics for treatment or prevention of infection, however, the utility of the polymers shown here are not limited to the use of antibiotics. Other drugs that could be potentially used in a drug release formulation from the polymers described here include medicines for the treatment of disease, injury or pain.
- the drug can be a protein, peptide, polysaccharide, nucleic acid molecule, or synthetic or natural organic compound.
- bioactive peptides or proteins such as growth factors, hormones, and cell attachment factors, anti-proliferative agents, antibiotics, chemotherapeutics, anesthetics, small drug molecules, steroids, enzymes, lipids, antigens, antibodies, surfactants, vitamins, flavoring agents, radioactive molecules, sweeteners, nutritional agents, and fragrances.
- the percentage loading of the drug will also depend on the specific treatment and the desired release kinetics.
- the polymers are suitable for drug loadings to at least 33% (i.e. polymer to drug ratios of 2:1). When the PHA polymers described here are loaded with drug (2:1), the drug release formulations remained flexible and retained good mechanical properties.
- the device is characterized by linear or zero-order drug release. In a more preferred embodiment, the device does not release a burst of the drug. Drug will typically be released over a period of at least 21 days, at least one month, at least three months, or at least six months. In general a linear release of drug is preferred.
- the length of time for the drug release can be controlled by selection of the drug, varying the drug loading and the shape and configuration of the drug release device. The examples show nearly linear release of the antibiotic drugs over a period of 18 days. It is expected that the period of release will extend beyond this time period and can be varied by the device configuration.
- the drug delivery systems are preferably manufactured by a method that evenly disperses the drug throughout the device, such as solvent casting, spray drying, and melt extrusion. They may also, however, be prepared by other methods such as compression molding and lyophilization.
- the delivery systems may take virtually any form, including granules, sheets, films, and particles, such as microspheres, nanospheres, microparticles, and microcapsules, as well as molded forms, such as patches, tablets, suspensions, pastes, rods, disks, pellets, and other molded forms.
- Preferred devices include microspheres and implantable molded devices. Desired release profiles may be further tailored by altering the physical shape of the delivery system. (For example, by altering the surface area or porosity of the device, or by varying the polymer to drug ratio.) Other components may also be introduced into the formulation as necessary to aid or improve delivery, administration, drug release, and/or monitoring.
- the method of administration of the drug delivery system will be dependent upon the type of drug and its known pharmaceutical properties, and the form of the delivery system.
- Small devices may be implanted, microspheres may be injected, patches affixed to the skin, and tablets, suspension, and capsules taken orally.
- Preferred methods of administration are by injection and implantation.
- these polymers are particularly useful for construction of drug release systems with controllable rates. They are also suitable for loading significantly larger quantities of drug within a typical controlled release sample.
- Non-limiting examples are given herein to describe the methods for preparing the drug delivery systems, and to illustrate the prolonged drug release profile and high drug loadings that can be achieved.
- PHA4400 Rod Preparation PHA4400 powder (Tepha, Inc., Cambridge, MA) (Mw -450 K) was weighed, placed in liquid nitrogen to render it brittle, and ground three times in a blender for 5 s duration. Chloroform was added to the resulting granules until a paste was formed, and then an antibiotic drug was added in a 2: 1 ratio of polymer.drug by weight. The paste was then introduced into a mold measuring 150x5x5 mm, and left to dry at ambient temperature. The dry molded formulation was removed from the mold, and sections 2 mm thick were cut yielding rods with approximate dimensions of 2x5x5 mm. Rod samples containing two different forms of tetracycline antibiotic were prepared.
- EXAMPLE 2 Drug Release from PHA4400 Rods A rod prepared as described in Example 1 was pre-weighed and introduced into a 50 mL Falcon tube containing 30 mL of 0.1 M pH 7.4 PBS (phosphate buffer). The tube was placed in a shaking water bath and maintained at 37 °C. Release of the antibiotic was determined by UN spectrophotometry using the extinction coefficients cited in Example 1 at 4 hours, 24 hours, and then daily with complete replacement of the release buffer with PBS. The release studies were carried out in a minimum of triplicate for each antibiotic.
- Chloroform was added to the resulting granules until a paste was formed, and then an antibiotic drug was added in a 2:1 ratio of poiyme ⁇ drug by weight.
- the paste was then introduced into a mold measuring 150x5x5 mm, and left to dry at ambient temperature.
- the dry molded formulation was removed from the mold, and sections 2 mm thick were cut yielding rods with approximate dimensions of 2x5x5 mm (as in Example 2).
- Rod samples containing two different forms of tetracycline antibiotic were prepared. These were a highly water soluble HC1 form, designated TC, and a neutral form, designated TCN (as above).
- EXAMPLE 4 Drug Release from PHA3444-34% Rods A rod prepared as described in Example 3 loaded 2:1 with TC or TCN was pre-weighed and introduced into a 50 mL Falcon tube containing 30 mL of 0.1 M pH 7.4 PBS (phosphate buffer). The tube was placed in a shaking water bath and maintained at 37 °C. Release of the antibiotic was determined by UV spectrophotometry using the extinction coefficients cited in Example 1 at 4 hours, 24 hours, and then daily with complete replacement of the release buffer with PBS. The release studies were carried out in a minimum of triplicate for each antibiotic.
- Penassay Broth Medium was prepared using the components in Table 1. The medium pH was 7.00 ⁇ 0.05 and the sterilization conditions were 121 °C for 15 min. For solid media, agar (1% w/v) was added prior to sterilization. The bacterial strain E. coli DH5 ⁇ was inoculated to 200 mL broth medium, shaken overnight at 37°C at 200 rpm in an orbital shaker. Inoculate 200 mL bacteria to the plates containing solid Penassay Broth Media. Table 1 : Penassay Broth Medium components
- Negative Control Applied 25 microliter buffer containing no drug onto the
- Polymers tested include PHA4400 and PHA3444-34%. The ration of polymer to Tetracycline antibiotic in the test sample rods is provided below each polymer sample. Table 2. Results of the Antibiogram Test
Abstract
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2004
- 2004-07-08 US US10/886,851 patent/US20050025809A1/en not_active Abandoned
- 2004-07-08 JP JP2006518932A patent/JP2007528853A/en active Pending
- 2004-07-08 CA CA002531833A patent/CA2531833C/en active Active
- 2004-07-08 ES ES04777860T patent/ES2395077T3/en active Active
- 2004-07-08 AU AU2004257701A patent/AU2004257701B2/en active Active
- 2004-07-08 EP EP04777860A patent/EP1651273B1/en active Active
- 2004-07-08 WO PCT/US2004/022040 patent/WO2005007195A1/en active Search and Examination
Non-Patent Citations (1)
Title |
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See references of WO2005007195A1 * |
Also Published As
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EP1651273B1 (en) | 2012-08-29 |
JP2007528853A (en) | 2007-10-18 |
WO2005007195A1 (en) | 2005-01-27 |
ES2395077T3 (en) | 2013-02-08 |
AU2004257701A1 (en) | 2005-01-27 |
US20050025809A1 (en) | 2005-02-03 |
AU2004257701B2 (en) | 2007-09-13 |
CA2531833A1 (en) | 2005-01-27 |
CA2531833C (en) | 2009-10-20 |
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